Flea

Size: Fleas are tiny insects measuring about 1/16-inch in length, and are laterally flattened.

Color: Reddish brown.

Their flat shape allows them to easily pass between the hairs of animals. The cat flea is the species involved in most home infestations and will attack both cats and dogs. It is usually carried into the home by a pet and once inside, large populations can build up in a hurry.